The rule came at the urging of Democrats like Senator Elizabeth Warren and worker groups like the AFL-CIO.

And it was approved despite opposition from the business community and Republicans.

The Chamber of Commerce is expected to sue over the rule. The head of its Center for Capital Markets Competitiveness David Hirschmann said that the rule “is more harmful than hurtful” and that the Chamber will seek to “clean up the mess. “To steal a line from Justice Scalia, this is pure applesauce,” SEC Republican Commissioner Daniel Gallagher said to Reuters. Companies argued that calculating median wages of workers is not cut-and-dry, especially for companies with lots of overseas workers, and that the new rule represented unnecessary and costly regulation.

Companies with the highest ratios will likely have the most explaining to do. First up might be CVS.

According to a Payscale report, which calculated ratios based on the cash compensation of CEOs at the 100 highest-grossing public companies in the United States in 2013, CVS CEO Larry Merlo has the highest pay compared to his employees: $12,112,603—422 times as much as the average CVS employee, who earns $28,700 per year.

Next up is Goodyear CEO Richard Kramer, whose cash compensation of $15,086,645 resulted in a CEO-to-worker pay ratio at the company of 323-to-1. Third place is Disney’s Bob Iger who earned $12,112,603 in 2013—283 times more than the average Disney employee’s compensation of $60,300.

Interestingly enough, the lowest ratios occurred at Google, where CEO Larry Page earned $1 in 2013 and at Sears, where CEO Eddy Lampert, earned the same. Next lowest is HP’s Meg Whitman, whose cash compensation of $535,335 in 2013 was just six times as much as the average HP employee’s—$84,500, followed by Warren Buffett, who earned $485,606 in cash in 2013—nine times more than the pay for Berkshire Hathaway employees, who make, on average, $56,900.